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Show allPOWER DELAY PROFILE ESTIMATION TECHNIQUE FOR LMMSE CHANNEL ESTIMATOR OF MIMO-OFDM SYSTEM
Abstract
A multiple-input multiple-output (MIMO) communication system combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over broadband wireless channels. But the performance gain depends heavily on accurate channel estimation. In linear-minimum-mean-Square error (LMMSE) channel estimation for multicarrier system, one needs to know the channel statistics. We propose a power delay profile (PDP) estimation technique to obtain the frequency domain channel statistics at the receiver. The pilot symbols of all transmit antenna ports are used in estimating the PDP. The estimated PDP is used to generate the LMMSE filter Coefficients for data-subcarrier channel estimation. The distortions caused by null subcarriers and an insufficient number of samples for PDP estimation are also considered. The proposed technique effectively reduces the distortions for accurate PDP estimation. Simulation results show that the performance of LMMSE channel estimation using the proposed PDP estimate approaches that of Wiener filtering due to the mitigation of distortion effects.
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References
R. Horn and C. Johnson, Matrix Analysis. Cambridge University Press, 2009.
H. C. Won and G. H. Im, “Iterative cyclic prefix reconstruction and channel estimation for a STBC OFDM system,” IEEE Commun. Lett., vol. 9, pp. 307–309, Apr. 2005
M. G. Song, D. Kim, and G. H. Im, “Recursive channel estimation method for OFDM-based cooperative systems,” IEEE Commun. Lett., vol. 14, no. 11, pp. 1029–1031, Nov. 2010.
U. K. Kwon, D. Kim, and G. H. Im, “Amplitude clipping and iterative reconstruction of MIMO-OFDM signals with optimum equalization,” IEEE Trans. Wireless Commun., vol. 8, pp. 268–277, Jan. 2009.
L. Zheng and D. N. Tse, “Diversity and multiplexing: a fundamental tradeoff in multiple antenna channels,” IEEE Trans. Inf. Theory, vol. 49, pp. 1073–1096, May 2003.
H. C. Won and G. H. Im, “Iterative cyclic prefix reconstruction and channel estimation for a STBC OFDM system,” IEEE Commun. Lett., vol. 9, pp. 307–309, Apr. 2005.
T. Yoo and A. Goldsmith, “Capacity and power allocation for fading MIMO channels with channel estimation error,” IEEE Trans. Inf. Theory, vol. 52, pp. 2203–2214, May 2006.
M. G. Song, D. Kim, and G. H. Im, “Recursive channel estimation method for OFDM-based cooperative systems,” IEEE Commun. Lett., vol. 14, no. 11, pp. 1029–1031, Nov. 2010.
T. W. Yune, C. H. Choi, G. H. Im, J. B. Lim, E. S. Kim, Y. C.Cheong, and K. H. Kim, “SC-FDMA with iterative multiuser detection: improvements on power/spectral efficiency,” IEEE Commun. Mag., vol. 48, no. 3, pp. 164–171, Mar. 2010.
S. Omar, A. Ancora, and D. T. M. Slock, “Performance analysis of general pilot-aided linear channel estimation in LTE OFDMA systems with application to simplified MMSE schemes,” in Proc. IEEE PIMRC 2008.
T. Cui and C. Tellambura, “Power delay profile and noise variance estimation for OFDM,” IEEE Commun. Lett., vol. 10, pp. 25–27, Jan. 2006
TS 36.211, “Physical channels and modulation,” in 3GPP TSG RAN1, Rev. 10.1.0, Jan. 2011.
K. C. Hung and D. W. Lin, “Pilot-based LMMSE channel estimation for OFDM systems with power-delay profile approximation,” IEEE Trans. Veh. Technol., vol. 59, pp. 150–159, Jan. 2010.
Y. Li, J. H. Winters, and N. R. Sollenberger, “MIMO-OFDM for wireless communications: signal detection with enhanced channel estimation,” IEEE Trans. Commun., vol. 50, pp. 1471–1477, Sep. 2002.
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